When I first saw the picture I thought it was Lady Gaga too. I don’t know this girl actually, I don’t know if she is a bad girl or whatever but this Alberta Ferretti gown is BEAUTIFUL and she looks great. Definitely wrong choice for the occasion though.

Wrong dress on wrong person, wrong occasion… I think it’s a beautiful dress, but she doesn’t do it justice at all. Plus, as you correctly said, she should have opted for something more toned-down, as she is not the star of the movie.

uhm have we ever seen peaches and gaga out on the same day????? X-D LOL any way the dress is stunning but not for her and it reminds me A LOT of the Alberta Ferretti gown Drew Berrymore wore whilst promoting Grey Gardens

A “good” girl would never have nails that nasty at a red carpet event. I think that solves the “is this an act” question.
Didn’t she formerly have 3″+ black roots and bleach blonde hair? Maybe I’m thinking of someone else, but if she did than the hair is at least an improvement.